Pitman-boxing.



1. CHURCHILL.

PITMAN BOXING.

APPLICATION nuan smao. 191a. RENEWED APR. 26. $915.

Emma July 27, 1915.

WITNESSES [MENTOR fi$ James Churchill...

n "I By ATTORNEYS JAMES CI-l'UBQHILL, 0F REWARD, CALIFORNIA.

PITMAN-BOXING.

Specification of Letters Patent.

Patented July at, 1915.

Application filed January 30, 1913, Serial No. 745,156. Renewed April 26, 1915. Serial No. 24,158.

blocks, and will make a quickly demount" able accurate bearing.

The above outlined objects are obtained by providing in the pitmans body an angu-' lar aperture in which relatively movable bearing blocks are provided and a lever of the first-class associated with one of these blocks for operating same and the resilient member for normally forcingthe bearing blocks together within the angular aperture.

Figure 1 is a side elevation of an embodi-' ment of my invention with part of the face plate broken away; Fig. 2 is a section on line 22 Fig. 1; and Fig. 3 is a top plan view of the reciprocating bearing block.

Referring to the drawings, 10 represents the lower portion of, the pitman, in which is provided centrally a rectangular aper-- Positioned in the aperture 11 against the shorter sides are blocks menu; 13, of any suitable material, but preferably-E Threaded in one of theses,"

' of 'theblock 12 is cut away, as shown in.

Fig. 1,'permitting the displacement of the ture 11.

of cast iron.

blocks is a plurality of pins 1 1 engaging the other block 13 loosely, so that by unscrewing the pins 14: from the block 12 the two blocks are forced against the shorter sides of the aperture 11, and the pins are preferably close to the longer sides of the aperture 11 leaving sufficient space about the wrist pin. The blocks 12 and 13 have an edge portion cut away so as to be flush with the surface of the body of the pitman, and engaging this cut-away edge and the face of the pitman is a plate 15 bolted or secured to the pitman in any desired way, and thereby preventing-the displacement of the blocks 12 and 13. Intermediate the two blocks 12 and 13 another block 16 is provided which engages the-pins 14 by means of notches 17 and with the lower block constitutes the bearing for the wrist pin. ,The blocks 16 and 13 are preferably babbitted. The block 16 the body .ratchets 2 positioned on the free end of the lever 21 16 at its upper end opposite the bearing por tion is provided with ears 18 through which pro ects a pin 19.

Engaging under the pin 19 between the ears 18 is the curved portion 20 of a first class lever 21, the fulcrum 22 of which is positioned in the upper block 12. The free end of the lever 21 is provided with a handle 23, and the same side of the lever is provided with a coil spring 24 connecting the lever with a pin 25 positioned inthe body of the pitman, the tendency of the spring being to force the free end of the lever up and consequently forcing the curved "end 20 of the lever 21 downward,-the.

lower curvedportion of the curved end-of the lever; 21- bearing constantly against-a fiat portion 26 provided between the'ears of the bearing block 16. To prevent accidental upward motion of the bearing block of the pitman is provided with engaging a finger portion 28 near the handle 23 and normally engaging the 'ratchets. I

It can be seen from the drawin sthat 'while the ratchets will not prevent-t e motion of the free end of the lever upward it will prevent its motion downward. A member 29 is provided in the handle 23 of the lever 21 by means of which the finger portion 28 can bemadeto disengage from the ratchets 27 A spring 30 is posltioned in a .closedportion onf-the lever 21 and forces normally the To allow the b ock 16 to move up a portion bearing block 16 into the position shown in dotted lines in Fig. 1 and maintaining it there when necessary. A catch or pawl 31 is pivotally mounted on the body of the pitman lay-means of a pivot 32, and a spring 33 is constantly bearing against the pawl 31 ltd in 28 j into the ratchets 27.

maintaining it in a position to catch the lever 21 when .the same is thrown in the position shown in dotted lines in Fig. 1, and preventing its going up under the action of the coil spring 24c unless the catch or pawl 31 is disengaged from the lever.

As all the wear in the bearing provided in a pitman as used for well boring is in the lower portion or block 13, the upper block must be forced against the wrist pin with suiiicient force only to take up the wear produced in the lower block, and in consequence of this the coil spring 24 is made sullicientlv strong to produce this ac- -tion. Any upward; strain on the upper block 16 is contracted through the lever 15 21, linger 28 and ratchets Y \Vhen it is de ired to Selim-11mm pitma'n from the; wrist pin or to repair the bearings, the

lever by means of the member 29 is first J disengaged from the ratchets .27 and forced down'until the catch llfiengages the lever 21 whereby the bearing bloelc 16 is car- ,ried up "to uppermost posit on andmamr i i tained there. This permi'tsthe removal of the l wrist pin' or removal of the bearing 'i15-blocks-13 and 16 when necessary by; first removing on one side the face plate 15 and "then removingthe blocks 13 and 1(3. The blocks 13 and 16 are removed by simply 'forcing the pin, l-l up into the block 12. 20 This will allo -wthe removal of the lower block and by removing. the. pin 19' from H the'e ars 18 of the block 16, the same may be removed: When-replacing :the' bearing 1 blocks the action is reversed. V Having thusv described my invention, I claim as new andldesire to secure b vr Let- "ters Patent: r

1. In a pitman boxing, a body havinga rectangular aperture, a block against each "80 6f said shorter sides in said aperture, ad ,"justable means engaging said blocks and maintaining the same against the shorter side, a block intermediate saidblocks'slidably mounted on said adjustable means and 86. forming with one of said blocks the hear- "ing portion, face plates engaging said body :andsaid blocks'and preventing their side displacement,a -levei' of the first class en: gaging" said first intermediate block and 40 having its fulcrum on the block not c0nstitutingfthe bearing portion with the intel-mediate block, resilient means connecting said body and the free end of said le- 'ver whereby said intermediate. block is vMi'forcedagainst said block forming with it i the bearing portion, and means on said body r whereby said intermediateblock canqbe placed 'in a predetermined. position. i

2. In a pitman boxinga :bodyhaving an '7 60 angular'aperture, blocks'in said aperture,

, normally said movable block under the means engaging'said blocks and normally keeping said blocks against the opposite sides of said, aperture, a block mtermerhate "said blocks engaging the allove-nientioned means, and a lever ot' the lirst classassoeiated with said intermediate. block for translating the same on said means. said intermediate block and one of said blocks forming the bearing portion, resilient means associated with said lever for normally forcing said intermediate block toward the block forming the bearing portion with it. and means on said bod)- and said lever whereby said intermediate block can onl move toward said block forming the bearing with it under the force ot said resilient means.

23. In a pitman boxing. a bodvhaving a bearing therein formed of a lixed and a movable block, a lever oi the first class associated with said movable block. a ratchet on said body, a member on said lever engaging said ratchet. a resilient member connected with said lever and said body and normally forcing said movable bloclt against the liXed block, and means on said :body, adapted to engage said lever when said lever is forced into a predetermined position.

'4. To a pitman boxing, a body having, a

bearing therein formed of a lived and a movable l)l0('l\'. said movable block having engaging means, a lever ot' the lirst class having the curved portion engaging slidably said means on said movable block. and

a coil spring associated with the opposite end of said lever and said body thereby forcing said movable block against. said fixed block. said curved portion of said lever normallyhearing against action of said coil spring.

Intestiniony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES (llURGl-IILL.

Witnesses ELI W. llo'r'rnL,

: Zacmvnmn S'roKes. 

